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Thermal stability of Cu@Ag core-shell nanoparticles

机译:Cu @ Ag核壳纳米粒子的热稳定性

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摘要

In this study, the structural evolution and oxidation of Cu@Ag core-shell nanoparticle deposits (with average particle diameter of 25 nm and Ag/Cu atomic ratio of 1/8) upon heating in air were investigated quantitatively via in situ synchrotron radiation X-ray diffraction. With an increasing temperature, the coalescence of Cu cores and ripening of Ag shell occurred simultaneously, resulting in discrete Ag nano-nodules and unprotected Cu microparticles. Due to the protection of the thin Ag shell, the formation temperatures of the Cu oxides for Cu@Ag NPs were higher than those for pure Cu nanoparticles with similar size by at least 150 ℃.
机译:在这项研究中,通过原位同步辐射X定量研究了在空气中加热时Cu @ Ag核壳纳米颗粒沉积物(平均粒径为25 nm,Ag / Cu原子比为1/8)的结构演变和氧化。射线衍射。随着温度的升高,Cu核的聚结和Ag壳的成熟同时发生,从而形成离散的Ag纳米结节和未保护的Cu微粒。由于保护了薄的银壳,Cu @ Ag NPs的铜氧化物的形成温度至少比具有相似尺寸的纯Cu纳米粒子的形成温度高至少150℃。

著录项

  • 来源
    《Corrosion science》 |2013年第9期|123-129|共7页
  • 作者单位

    Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology. Taipei 106, Taiwan;

    Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan;

    Department of Materials Science and Engineering, National Chung Hsing University, Taichung 402, Taiwan;

    Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan;

    National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Copper; Silver; Oxidation; TEM; XRD; XPS;

    机译:铜;银;氧化;TEM;XRD;XPS;

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